Diodes Incorporated ZXCT210CDW-7

Overview

ZXCT210CDW-7 from Diodes Incorporated is a zero-drift, high-precision current-sense amplifier with 200V/V fixed gain, ±30μV max offset voltage, and ±0.5% max gain error over temperature. It operates from 2.7V to 26V supply, supports -0.3V to 26V common-mode input range, and delivers rail-to-rail output for accurate shunt-based current monitoring in high-side or low-side configurations - used in server power supplies and battery management systems.

For engineers reviewing the ZXCT210CDW-7 datasheet, ZXCT210CDW-7 pinout, ZXCT210CDW-7 application, or ZXCT210CDW-7 equivalent, this device is selected for ultra-low drift precision at full industrial temperature range (-40°C to +125°C), minimal 10mV full-scale shunt drop capability, and compatibility with 12-bit+ ADC interfaces in power-constrained embedded systems.

Technical Context

The ZXCT210CDW-7 employs a chopper-stabilized zero-drift architecture with post-trim calibration to achieve ±30μV max input offset and 10ppm/°C max gain drift across -40°C to +125°C. Its differential input stage rejects common-mode voltages up to 26V while powered from as low as 2.7V, enabling direct sensing on high-voltage rails without level-shifting.

It features rail-to-rail output swing (within 50mV of rails), 14kHz bandwidth (C_L = 10pF), and 100μA max quiescent current. The REF pin allows configurable unidirectional or bidirectional current measurement by setting output bias point - critical for battery charge/discharge monitoring where polarity reversal must be resolved.

Key Specifications

Pinout & Package

SOT363-6 package: 2.1mm × 2.0mm × 0.9mm body, lead pitch 0.65mm, thermally enhanced with exposed pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-precision current sensing applications.

Compared with INA240A1QDRQ1 and MAX40016AUB+, the ZXCT210CDW-7 uniquely balances ultra-low offset (±30μV), 24V rail compatibility, and industrial temperature range - making it optimal for cost-sensitive, non-automotive 24V embedded systems requiring long-term calibration stability.

Availability

ZXCT210CDW-7 is available at Aetrix Electronics and suitable for server power supplies, battery management systems, industrial PLC modules, and high-performance GPU power rail sensing requiring stable component supply across extended production lifecycles.

Supply support for ZXCT210CDW-7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and connectivity applications.

The ZXCT21x series belongs to Diodes' precision analog product line, designed specifically for high-accuracy, low-drift current sensing in industrial, computing, and telecom infrastructure where thermal stability and wide common-mode operation are essential.

FAQ

What is the maximum shunt resistor voltage drop supported by ZXCT210CDW-7?

The ZXCT210CDW-7 supports a full-scale shunt voltage drop of 10mV, meaning it is optimized to accurately measure currents using shunt resistors that develop ≤10mV at full load. With its 200V/V gain, this yields a 2.0V output swing - ideal for direct interface with 2.0V or 3.3V ADC references. Using larger shunt drops increases power loss and may exceed input common-mode limits if improperly configured.

Can ZXCT210CDW-7 be used for bidirectional current sensing?

Yes - by applying a bias voltage (typically V+/2) to the REF pin, the output swings above and below that reference to indicate current direction. This configuration is validated in the datasheet for battery charge/discharge monitoring. The device's rail-to-rail output and low offset ensure symmetrical positive/negative reporting with <10mA resolution at 10mΩ shunt, provided the REF source has <10Ω impedance to avoid gain error.

Does ZXCT210CDW-7 require external filtering for EMI immunity?

No external filtering is required for basic operation, but input RC filters (RS ≤10Ω + CF) are recommended in noisy environments or with inductive shunts (<1mΩ) to prevent instability. The datasheet specifies RS must not exceed 10Ω to avoid degrading CMRR and introducing gain error from input bias current mismatch. Layout best practices - such as short, matched IN+/IN− traces and local 100nF bypass - provide sufficient EMI rejection for most industrial applications.

How does the C-grade version differ from A/B versions of ZXCT210?

The C-grade (ZXCT210CDW-7) offers ±0.5% max gain error and ±30μV max offset voltage over -40°C to +125°C, versus ±0.8% and ±30μV (B) or ±35μV (A). This tighter specification is achieved via post-package trim and is guaranteed across full temperature range - making it suitable for applications where calibration stability over thermal cycling is critical, such as unattended industrial controllers or telecom base station power modules.